#2183B3
Closest named color: Blue NCS (#118AB2). oklch(57.8% 0.113 235.7), rgb(33, 131, 179).
Aa
Black text reads best on this color (4.96:1).
About this color
#2183B3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.113 and its hue 236°. Its hue sits on the cool side of the wheel. The nearest named color is Blue NCS (#118AB2), ΔE 0.021 away. Black text reads best on it, at 4.96:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.113) |
| Temperature | cool |
| Nearest name | Blue NCS (#118AB2) |
| Black text | 4.96:1 |
| White text | 4.23:1 |
Values
| HEX | #2183B3 |
| RGB | rgb(33, 131, 179) |
| HSL | hsl(200, 69%, 42%) |
| OKLCH | oklch(57.8% 0.113 235.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #2183B3 | 4.23:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #2183B3 | 4.96:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #2183B3 text on white | 4.23:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #2183B3 text on black | 4.96:1 | AA | Lc -32.9 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F1F6F9
oklch(97% 0.007 233.6)
-
Step 100
100
#E1ECF2
oklch(93.7% 0.014 231.2)
-
Step 200
200
#C8DDEA
oklch(88.6% 0.029 234.9)
-
Step 300
300
#A2C6DD
oklch(80.8% 0.05 236.3)
-
Step 400
400
#6DA9CD
oklch(70.7% 0.082 235.9)
-
Step 500
500
#4193C0
oklch(63.2% 0.104 235.8)
-
Step 600
600 (this color)
#2183B3
oklch(57.8% 0.113 235.7)
-
Step 700
700
#016994
oklch(49.2% 0.105 235.6)
-
Step 800
800
#0B5578
oklch(42.6% 0.088 236.3)
-
Step 900
900
#154760
oklch(37.7% 0.067 234.6)
-
Step 950
950
#0F2A38
oklch(27.1% 0.042 233.9)
#2183B3 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #6C82B5 | 0.067 |
| Deuteranopia (no green cones) | #5875B2 | 0.055 |
| Tritanopia (no blue cones) | #008F94 | 0.069 |
| Achromatopsia (no color) | #7B7B7B | 0.113 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #2183B3
#2183B3
oklch(57.8% 0.113 235.7)
- #AC6630
#AC6630
oklch(57.8% 0.113 55.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #2183B3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blue NCS #118AB2 ΔE 0.021
- Steel Blue #4682B4 ΔE 0.025
- Nice Blue #107AB0 ΔE 0.028
- Cool Blue #4984B8 ΔE 0.030
- Water Blue #0E87CC ΔE 0.038
- Cerulean #457B9D ΔE 0.039
- Teal Blue #01889F ΔE 0.040
- Windows Blue #3778BF ΔE 0.041
Use #2183B3 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.